Recording a radio show...

There's this radio show that I enjoy listening to. However, it's from
midnight to 5a and I need my sleep. Is there a good way to record the show
onto my computer and burn in onto CDs so I can toss it into my discman??
I've got a Beige G3 PowerMac with RCA input jacks on the personality card.
Any suggestions? Thanks.
--markemmanuel